Nationwide is the fourth largest mortgage lender in the country, and the second largest savings provider. Nationwide Building Society evolved in Northampton and London in the 19th century. Nationwide are the largest building society in the world, and they are 100 per cent committed to staying mutual.
Typically building societies only lend the money they have access to via the savings accounts that the building societies hold. This gives the building society a level of security that many banks do not have.